Two people were injured Thursday when their vehicle went off northbound Highway 101 and down an embankment, hitting two trees and landing on its roof, police said.

The crash occurred at 2:45 p.m. at the railroad overpass just north of Rowland Boulevard. Both people in the 2006 Mercedes were trapped inside the vehicle as it rested upside down on the descent toward the railroad tracks.

“We were able to cut both side doors and get them out that way,” said Novato fire Battalion Chief Mark Heine.

The driver, 71-year-old George Marlow of Novato, suffered chest pain, while his passenger, 69-year-old Elaine Marlow of Novato, suffered a cut on the head, said Officer Chris Rardin of the California Highway Patrol.

Both were taken to Kaiser Permanente Medical Center for treatment.

The driver told police that he blacked out before the collision, but police were investigating whether he made an unsafe lane change, Rardin said.

There was no indication the driver was intoxicated, said CHP Officer Glenn Newcomer.